What I think would be a really good improvement is adding a "Test Fire" option before you buy a gun. This would help out those people that have several guns in mind but don't know which one to get. I mean, yea there are guides with the stats but numbers aren't much help other then the fact that the gun is good or bad. When you tap on the gun you want to buy, there should be an option to test fire the weapon. When you tap on it, you get warpped to a firing range where you can test out the gun you want with multiple targets to shoot at. This would really help the player get a feel of the gun such as getting to know the freeze, fire rate, etc.
Feel free to Let me know your opinions on this idea